Minor improvements in Makefile for new releases

[shachafl]

Description

Some minor updates to the Makefile for releasing new versions of starfish:

1. Avoiding error message when a branch for a new release has the same name as the new tag (i.e. 0.4.0).
2. For Pypi - twine makes a wheel as well as a tar.gz file and we want to upload both to Pypi.

Fix is easy:

1. Replace git push origin $(VERSION) with git push origin tag $(VERSION)
2. Replace twine upload dist/starfish-$(VERSION).tar.gz with twine upload dist/starfish-$(VERSION)*